Best Time to Fly MDW to BWI: On-Time Stats by Hour & Airline
Chicago Midway International → Baltimore/Washington International Thurgood Marshall
Data through July 2026 · Last updated October 18, 2026
1,857 flights were scheduled from Chicago (MDW) to Baltimore (BWI) in the last 12 months, and 79.0% of those that flew arrived on time, 1.4 points above the US average of 77.6%.
Frontier Airlines was the most punctual of the 2 airlines on the route at 82.9%, while Southwest Airlines trailed at 78.9%.
January has been the best month (89% on time) and Monday the weakest day of the week (74%).
2.7% of flights were cancelled, versus 1.8% nationally.
MDW to BWI on-time performance by airline
Last 12 months. Airlines with fewer than 30 completed flights are marked “limited data”.
| Airline | On time | Avg delay when late | Cancelled | Flights |
|---|---|---|---|---|
| Frontier Airlines | 82.9% | 81 min | 1.4% | 71 |
| Southwest Airlines | 78.9% | 58 min | 2.7% | 1,786 |
80%+ good 70–79.9% fair <70% poor
Best time of day to fly MDW to BWI
On-time arrival % by scheduled departure hour (local time), 3,790 flights over 24 months.
Show the numbers
| Departure hour | On time | Cancelled | Flights |
|---|---|---|---|
| 5am–6am | 93.7% | 0.4% | 254 |
| 6am–7am | 96.1% | 1.9% | 259 |
| 7am–8am | 91.6% | 0.7% | 406 |
| 8am–9am | 93.1% | 1.0% | 206 |
| 9am–10am | 87.5% | 0.7% | 274 |
| 10am–11am | 85.2% | 3.7% | 162 |
| 11am–12pm | 84.6% | 1.1% | 177 |
| 12pm–1pm | 83.5% | 3.3% | 244 |
| 1pm–2pm | 83.5% | 0.8% | 264 |
| 2pm–3pm | 66.5% | 1.1% | 175 |
| 3pm–4pm | 70.0% | 1.4% | 72 |
| 4pm–5pm | 71.3% | 2.5% | 198 |
| 5pm–6pm | 67.1% | 3.8% | 313 |
| 6pm–7pm | 72.2% | 2.4% | 246 |
| 7pm–8pm | 56.1% | 2.5% | 203 |
| 8pm–9pm | 62.6% | 3.0% | 169 |
| 9pm–10pm | 60.3% | 3.1% | 161 |
| 10pm–11pm | Limited data | 7 | |
Best day of the week
24 months, by day of departure.
Best month to fly
24 months, by calendar month.
Holiday travel on MDW to BWI
On-time arrivals during holiday periods compared with all other days, last 24 months.
| Period | On time | vs other days | Cancelled | Flights |
|---|---|---|---|---|
| Thanksgiving week (Tue before to Mon after) | 81.3% | -1.3 pts | 6.2% | 80 |
| Christmas & New Year (Dec 20 - Jan 3) | 75.8% | -6.8 pts | 0.7% | 150 |
| Summer peak (Jun 15 - Aug 15) | 69.3% | -13.3 pts | 2.8% | 754 |
| All other days | 82.6% | — | 1.6% | 2,806 |
Monthly on-time trend
On-time arrival % each month, with the 12-month US average for reference.
What causes delays on this route
Share of reported delay minutes, last 12 months (BTS cause categories).